The Defense Information Systems Agency (DISA) is seeking to negotiate a sole source contract with PKWare, Inc. for annual software maintenance support of its PKZip and PK Encrypt products, which are critical for DISA's mainframe operations. This contract will ensure continued support for existing PKWare licenses and accommodate potential additional licenses due to hardware upgrades or increased demand. The embedded nature of PKWare software within DISA's operations necessitates this sole-source approach, as transitioning to another vendor would incur significant unbudgeted costs. Interested parties may submit their capabilities, but proposals will not be accepted as this notice is not a solicitation. The contract's base period of performance is from October 1, 2025, to September 30, 2026, with inquiries directed to Stephanie Markus at stephanie.r.markus.civ@mail.mil or Lisa Pregartner at lisa.pregartner2.civ@mail.mil.